TV Screen goes Blue, or Red, picture fades out to Blue or Red.

I have a 26" JVC 20years old. Works great until once in a while, the picture tube goes to solid red with white lines threaded across screen. It turned blue yesterday. When I switch the set off and on, the picture will come back highly blueish, but fades completely to blue in a few second...or the picture will very slowly fade to solid blue.

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Related Questions:

HI:
Your problem is the blue CRT or picture has gone bad, you will need to have the picture replaced, there are three tubes in this model rear projection television. Red, Green, and Blue. Replaceing the blue tube is the only option for normal operation to resume. It may be hard to find the tube, but you can try contacting this website for the part www.vdc.com, they manufacture and usually have stocks of sony picture tubes and rebuilt ones as well. The company's name is Video Display Corporation...

These sets kp51ws500 had issues with bad picture tubes----this set uses a Red,Green and blue picture tube.

The tubes are only available on a rebuild basis and very expensive. There is one thing that requires no parts replaced you can try: here are the instructions:

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SONY WITH
BLUE SCREEN PROBLEM:
You may have a bad blue picture tube but there is a way to
deal with this first----the set has a black plastic block with six
controls---three are Focus(red,green,blue) the other 3 controls are Screen
controls(red, green, blue) Someone has to remove the entire piece on the front
of the set below the screen(usually a plastic part) most of the time it is
secured with 3 screws on either side of the set in the back; once you remove
the screws the entire piece should pull out(pull from right to left(it will not
fall off or come out easy--it is held in with several large plastic pegs) With
it removed there is an inspection plate with 4 screws-----the screen/focus
block is behind it.

You need to look very closely at the block to identify the focus versus screen
controls----one row left to right will be marked Focus and the other row left
to right will be marked screen------YOU need to locate the Blue Screen
control(they are black like the block) With the set on(be careful) go to a video
input with nothing connected---if you
see a blue screen as well as the input number turn the BLUE SCREEN CONTROL
SLOWLY TO THE LEFT UNTIL THE BLUE is gone.

If this cures the problem you may only be buying yourself some time----if the
blue picture tube is bad sooner or later this trouble may return----I have seen
sets where this was adjusted and the set worked for a year or more with no
repeat of the trouble----replacing the blue tube would likely cost you 400 -
500 parts and labor.

I do this here for free so if this has helped you take a moment and give me a
vote here.

Are they thin, white lines running east to west? If so, they are called retrace lines and indicate that the screen settings for the picture tubes is set too high or there may be a mal-function of the CRT driver circuitry. Try adjusting the screen controls which are located behind the front grill of the TV behind an access panel. Once you remove the grill and access panel, you'll see a small control assembly the has two sets of controls. Three for adjusting the red, green, and blue focus, the other, the red, blue, and green screen controls. To adjust correctly, put the TV on an unused input(dark, blank picture) and adjust until there are no visable retrace lines or color in the image.

Can be 1 of 2 things. 1st the red tube just needs the voltage to it turned down. In the front of TV (you have to remove the lower front half of TV to access it) is a plastic square with 6 knobs. The from left to right top knobs control focus for blue,green red. The bottom knobs control voltage to each tube in same order (so lower right knob for red) turn SLOWLY to left to reduce voltage until excessive red and lines go away. If you over turn left or right set will turn off. If that does not fix it or if lines reappear then option 2 is that red picture tube is failing outright and needs replacement.

Three guns Red Blue and Green in the picture tube of an old CRT set. If one of the guns goes out it effects that color. Sounds like one of the guns inside of the tube is going out, To costly to replace for such an old antilog set that will have to have a convertor box next month anyway.

The most common cause for what you are seeing is a shorted gun in the picture tube. When 2 elements (heater and cathode) of one of the guns inside the neck of the picture tube touch, that gun goes full on and overloads the flyback (high voltage) transformer. If it is in the blue gun, the screen will go bright blue with light blue "retrace" lines in it. The computer senses the overload and shuts the set off. At 2 years old the tech most likely tried removing the short by arcing between the elements. This works sometimes but the short often comes back a few months later. Another attempt at removing the short could be tried, and it might work this time, but it may or may not work for long. The ony other solution is to replace the picture tube but that would cost much more than the set is worth. A qualified tech will be able to tell you if this is the problem in your set.

Sounds like you have a problem with the blue gun in your picture tube or its drive circuit.
You might remove the back cover and gently tap on the neck of the picture tube using a plastic
screwdriver handle while watching the screen in a mirrow. If the picture flashes back on or on and off then the picture tube is the problem.
If this is a projection tv you have three separate tubes : red, green & blue.
you'd need to tap the blut one.Gently!!!!
Stargazer